在窗体上画一个名为CommonDialog1的通用对话框，一个名称为Command1

问题：

在窗体上画一个名为CommonDialog1的通用对话框，一个名称为Command1的命令按钮。要求单击命令按钮时，打开一个保存文件的通用对话框窗口。该窗口的标题为“Save”，默认文件名为“SaveFile"，在“文件类型”栏中显示“*.txt”。能够满足上述要求的程序是 ______ 。

A．Private Sub Command1_ Click()CommonDialog1. FileName = "SaveFile"CommonDialog1. Filter = "All Files ｜ *.* ｜*.txt *.txt｜ *.doc｜ *.doc"CommonDialog1. Filterlndex = 2CommonDialog1. DialogTitle = "Save"CommonDialog1. Action = 2 End Sub

B．Private Sub Command1_Click()CommonDialog1. FileName = "SaveFile"CommonDialog1. Filter = "All Files ｜*.* ｜ *.txt｜*.txt｜*.doc｜*.doc"CommonDialog1. Filterlndex = 1CommonDialog1. DialogTitle = "Save"CommonDialog1. Action = 2 End Sub

C．Private Sub Command1_ Click()CommonDialog1. FileName = "Save"CommonDialog1. Filter = "All Files ｜%* ｜*.txt｜*.txt｜*.doc｜*.doc"CommonDialog1. Filterlndex = 2CommonDialog1. DialogTitle = "Save"CommonDialog1. Action = 2 End Sub

D．Private Sub Command1_ Click()CommonDialog1. FileName = "SaveFile"CommonDialog1. Filter = "All Files ｜*.*｜*.txt｜*.txt｜*.doc｜*.doc"CommonDialog1. Filterlndex = 1CommonDialog1. DialogTitle = "Save".CommonDialog1. Action = 1 End Sub